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(N0 Modem 1. F. PECK.

MANUFACTURE OF HOLLOW RIVETS.

No. 415,298. Patented Nov. 19, 1889.

llliih UNITED STATES PATENT OFFICE.

IRA F. PECK, OF PROVIDENCE, RI'IODE ISLAND.

MANUFACTURE OF HOLLOW RIVEITS.

SPECIFICATION forming part of Letters Patent No. 415,298, dated November19, 1889.

Application filed March 18, 1889.

To all whom, it may concern.-

Be it known that I, IRA F. PEOK, a citizen of the United States,residing at Providence, in the State of Rhode Island, have invented anew and useful Improvement in the Mannfacture of Hollow Rivets, of whichthe following is a specification.

IIeretofore hollow metallic rivets have been made from a solid rod ofsuitable size, which was turned down and drilled to form the requiredhollow shank; but this operation, though performed by means of automaticmachinery, is a comparatively slow and expensive one; and it is theobject of my invention to produce such rivets in a more economical andrapid manner.

My invention consists in forming up the rivet-s in suitable dies frompieces of solid wire of small diameter, as hereinafter fully set forth.

Figure 1 represents a side view of the cylindrical piece of solid wirefrom which the hollow rivet is to be made. Fig. 2 represents a side viewof the rivet-blank after the first operation. Fig. 3 represents a sideview of the rivet-blank after the second operation. Fig. =l represents aside view of the finished hollow rivet after the third operation. Fig.

5 represents an end view of the finished hollow rivet.

In the accompanying drawings, A represents a cylindrical piece of solidwire cut off Serial No. 308,776. (No model.)

at the proper length to form the desired hollow rivet; and in carryingout my invention the wire A is first placed in suitable dies and one endportion .a of the same pressed to form the flattened disk I), Fig. 2,after which the disk I) is to be drawn up in suitable dies to cup form,as shown in Fig. 3, thus forming the hollow shank c of the rivet, andthen the remaining portion a of the original blank A is to be upset toform the head C of the hollow rivet, as shown in Figs. 4 and 5.

Hollow rivets can be very rapidly and economically manufactured by themethod described, the rivets so made being of improved quality, and intheir manufacture the slow and expensive process of drilling out thehollow of the rivet as heretofore is avoided.

I claim as my invention- The described process of manufacturing hollowrivets, which consists in first upsetting one end of a solid wire blankto form a flattened disk, then drawing up the said disk to form a cup,which will constitute the hollow shank of the rivet, and then upsettingthe remaining solid portion of the blank to form the head of the rivet.

IRA F. PECK.

\Vinesses:

JOHN S. LYNCH, SOCRATES ScHoLFIELD.

